Cooling structure of a mold

Abstract

This invention relates to the field of mold technology and discloses a cooling structure for a mold, comprising: a mold core, on which a first water channel and a second water channel are formed; the first and second water channels are interconnected; the mold core has a first mounting hole that passes through and communicates with both the first and second water channels; a first insert, disposed in the first mounting hole, and having a first annular water groove and a second annular water groove thereon, the first and second annular water grooves being at different heights relative to the first insert; the first annular water groove communicating with the first water channel, and the second annular water groove communicating with the second water channel; the first insert having a through hole extending through it along its radial direction; the through hole intersecting with the extension lines of both the first and second water channels; and a first sealing ring fitted above and below the first and second annular water grooves. The advantages of this invention are that this cooling structure can realize the cooling circuit setup within the confined space of the mold, and has a good cooling effect.

Description

Technical Field

[0001] This invention relates to the field of mold technology, and more particularly to a cooling structure for a mold. Background Technology

[0002] In injection molds and die-casting molds, the plastic or metal used to mold the product reaches a high temperature. Therefore, it is necessary to cool the mold promptly to extend its lifespan and ensure the product can be quickly cooled and demolded, preventing defects such as sticking, burning, and deformation due to uneven cooling. Currently, the most common method is to incorporate water channels within the mold core. These channels remove the heat transferred from the high-temperature plastic or metal to the mold, thus reducing the temperature of both the mold and the product in a timely manner.

[0003] There are various types of cooling systems for existing molds, including oil cooling and water cooling, with water channels further divided into linear cooling and point cooling. The specific cooling method used depends on the specific situation. In general molds, the mold core material is the most expensive component. Reducing the size of the mold core material can effectively lower the mold manufacturing cost and improve the company's competitiveness. For some specific products, the arrangement of ejector pins is strictly required by the customer and cannot be easily changed. However, the following problems often arise: the ejector pins are too close to the water channels, leading to leakage after prolonged use; or the ejector pins easily interfere with the water channels, causing the ejector pins to break the water channels. Ejector pins breaking the water channels is unacceptable in both injection molds and die-casting molds because it will cause water leakage from the mold core into the mold, affecting the product's molding quality. Therefore, how to design a cooling system within the compact and confined space of a mold is a problem that needs to be solved.

[0004] For example, patent "CN104441518A" discloses a cooling water channel structure for a circular box-shaped injection mold. This structure solves the problems of uneven cooling and long pressure holding time inherent in traditional well-type cooling water channel structures, and also addresses the leakage problem of existing interlocking spiral water channel structures, ensuring cooling efficiency and mold lifespan. It includes a first rear mold insert and a second rear mold insert. During assembly, the ejector rod of the second rear mold insert passes through the first rear mold insert, and the ejector block of the second rear mold insert is fitted into the top cavity of the first rear mold insert. The first rear mold insert has spiral water channels extending along the height of the molding cavity surface around its outer periphery. The spiral water channels are integrally formed by additive manufacturing. This structure improves cooling efficiency, but the water channel processing is difficult, and it does not solve the problem of difficulty in setting up a cooling system in confined spaces. Summary of the Invention

[0005] In view of the above-mentioned shortcomings of the existing technology, the technical problem to be solved by the present invention is to propose a mold cooling structure that can achieve normal arrangement of cooling circuits even in a small space.

[0006] The technical solution adopted by this invention to solve its technical problem is to propose a cooling structure for a mold, comprising:

[0007] The mold core has a first water channel and a second water channel opened along its height direction; the first water channel and the second water channel are interconnected; the mold core has a first mounting hole, which passes through the first water channel and the second water channel and is connected to both the first water channel and the second water channel;

[0008] A first insert is detachably disposed in the first mounting hole; the first insert has a first annular water groove and a second annular water groove along its circumference, and the first annular water groove and the second annular water groove are at different heights relative to the first insert; the first annular water groove is connected to a first water passage, and the second annular water groove is connected to a second water passage; the first insert has a through hole along its radial direction; the through hole intersects the extension lines of both the first water passage and the second water passage.

[0009] Multiple first sealing rings are fitted onto the first insert; and the first sealing rings are fitted above and below the first annular water groove and the second annular water groove.

[0010] Furthermore, it also includes a pin sleeve and a pin, wherein the pin sleeve is detachably inserted into the through hole and the pin is movably inserted into the pin sleeve.

[0011] Furthermore, the top of the first insert is provided with a second sealing ring, and the second sealing ring is located between the first insert and the mold core; wherein the ejector pin sleeve passes through the second sealing ring.

[0012] Furthermore, a first threaded hole is provided at the bottom of the first insert.

[0013] Furthermore, a third water channel is provided on the mold core, and the first mounting hole passes through the third water channel and communicates with the third water channel; the third water channel is located above the first water channel and the second water channel;

[0014] The first insert has a third annular water groove along its circumference, the third annular water groove is above the first annular water groove and the second annular water groove, and the third annular water groove is connected to the third water channel; the first sealing ring is provided above and below the third annular water groove.

[0015] Furthermore, the first insert has a sealing groove along its circumference, the first sealing ring is disposed in the sealing groove, and the depth of the sealing groove is less than the diameter of the first sealing ring.

[0016] Furthermore, the first insert includes a first guide portion, a second guide portion, and a third guide portion arranged sequentially from bottom to top, and the cross-sectional area of ​​the first guide portion is larger than the cross-sectional area of ​​the second guide portion, and the cross-sectional area of ​​the second guide portion is larger than the cross-sectional area of ​​the third guide portion;

[0017] The first annular water tank is formed on the first flow guide, the second annular water tank is formed on the second flow guide, and the third annular water tank is formed on the third flow guide.

[0018] Furthermore, both the first and second water channels penetrate the same side of the mold core, and an inlet and an outlet are formed on the side.

[0019] Furthermore, it also includes a second insert and a third sealing ring. The mold core has a second mounting hole, which passes through the first water passage and the second water passage and is connected to the first water passage and the second water passage.

[0020] The second insert is detachably disposed in the second mounting hole, and the second insert is provided with a fourth annular water groove and a fifth annular water groove. The fourth annular water groove is connected to the first water channel, and the fifth annular water groove is connected to the second water channel. The third sealing ring is sleeved on the second insert, and the third sealing ring is provided above and below the fourth annular water groove and the fifth annular water groove.

[0021] Furthermore, the bottom surfaces of the first insert, the second insert, and the mold core are all flush; and the bottom surface of the mold core is provided with a plurality of second threaded holes along the periphery of the first insert and the periphery of the second insert.

[0022] Compared with the prior art, the present invention has at least the following beneficial effects:

[0023] In this invention, due to the complex structure of the product and the large sticking force during product molding, numerous ejector pins are arranged. The ejector pins occupy a large area of ​​the mold core, which restricts the arrangement of the linear cooling water channels and easily leads to the ejector pins breaking the water channels. With the ejector pin positions already determined and space limited, a first mounting hole is created on the mold core, penetrating both the first and second water channels. A first insert is then placed within this hole, connecting the first annular water channel to the first water channel and the second annular water channel to the second water channel. A first sealing ring seals both ends of each annular water channel to prevent cooling water from flowing out through the insert. In this configuration, the ejector pin positions do not need to be changed, and linear cooling is easily achieved (e.g., through deep hole drilling), resulting in good cooling performance. A third water channel is created within the mold core, connecting to the third annular water channel of the first insert, effectively creating a stepped cooling effect on the insert and further enhancing the cooling system's efficiency. Furthermore, regardless of whether it's the first, second, or third water channel, the cooling circuit can form an inlet and outlet on the same side of the mold core, facilitating the connection of cooling water from the injection molding machine or die-casting machine to the mold, resulting in high operational efficiency.

[0024] In this invention, the cross-sectional dimensions of the first, second, and third flow guides decrease progressively. This facilitates the installation of the first insert into the first mounting hole of the mold core and effectively improves the sealing effect of the first sealing rings on each flow guide, reducing the likelihood of leakage. A first threaded hole is provided in the middle of the bottom surface of the first insert, allowing tools such as taps and lifting rings to be screwed into the first threaded hole for easy removal when the first insert needs to be disassembled. At the ejector pin mounting hole of the second insert, a threaded section can be provided at its tail end, allowing the second insert to be easily removed without affecting the installation of the ejector pin. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the overall structure of the cooling structure of the present invention;

[0026] Figure 2 for Figure 1 Exploded view;

[0027] Figure 3 for Figure 1 Cross-sectional view of the first and second waterways along the central axis;

[0028] Figure 4 This is an assembly drawing simulating the first and second water channels and the first and second inserts in the mold core;

[0029] Figure 5 This is an assembly diagram simulating the third water channel and the first insert in the mold core;

[0030] Figure 6 This is an assembly drawing simulating the first, second, and third water channels and the first and second inserts in the mold core;

[0031] Figure 7 A half-sectional view of the assembled ejector pin, ejector pin sleeve, and first insert;

[0032] Figure 8 This is a planar schematic diagram of the first insert.

[0033] In the picture,

[0034] 1. Mold core; 10. First water channel; 11. Second water channel; 12. First mounting hole; 13. Third water channel; 14. Inlet; 15. Outlet; 16. Second mounting hole; 17. Second threaded hole; 18. Water baffle;

[0035] 2. First insert; 20. First guide section; 21. Second guide section; 22. Third guide section; 23. Through hole; 24. First threaded hole; 25. Sealing groove; 200. First annular water groove; 210. Second annular water groove; 220. Third annular water groove;

[0036] 3. First sealing ring;

[0037] 4. Ejector pin sleeve;

[0038] 5. Threshold pin;

[0039] 6. Second sealing ring;

[0040] 7. Second insert; 70. Fourth annular water tank; 71. Fifth annular water tank;

[0041] 8. Third sealing ring. Detailed Implementation

[0042] The following are specific embodiments of the present invention, which are described in conjunction with the accompanying drawings. However, the present invention is not limited to these embodiments.

[0043] like Figure 1-3As shown, the cooling structure of the present invention is optimally, but not limited to, used in injection molds. A mold cooling structure includes: a mold core 1, a first insert 2, a first sealing ring 3, an ejector sleeve 4, an ejector pin 5, a second sealing ring 6, a second insert 7, and a third sealing ring 8. The mold core 1 has a first water channel 10 and a second water channel 11 along its height direction. The first water channel 10 and the second water channel 11 are arranged vertically parallel to each other to facilitate drilling from the same side during processing. The height direction of the mold core 1 refers to the height direction of the mold when it is normally placed on the ground, i.e., the height direction of the mold core 1. The mold core 1 can be a separate mold frame and mold core, or it can be an integrated unit. The first water channel 10 and the second water channel 11 are interconnected, forming a loop. One is used for water inlet, and the other for water return, to remove the heat transferred from the high-temperature plastic to the mold, thus protecting the mold and... The product is cooled and refrigerated; the mold core 1 is provided with a first mounting hole 12, the size of which is larger than the diameter of the first water channel 10 and the second water channel 11, and the first mounting hole 12 passes through the first water channel 10 and the second water channel 11 and is connected to both the first water channel 10 and the second water channel 11; the first insert 2 is detachably set in the first mounting hole 12, so that it can be easily removed in time when problems such as water leakage or cracking occur; the first insert 2 is provided with a first annular water groove 200 and a second annular water groove 210 along its circumference. In this solution, the annular shape does not necessarily mean a circle, but refers to the circumference around the first insert 2. In actual cases, the first... The cross-section of the insert 2 is generally elliptical; and the first annular water channel 200 and the second annular water channel 210 are at different heights relative to the first insert 2. The first annular water channel 200 is connected to the first water passage 10, and the second annular water channel 210 is connected to the second water passage 11. The first insert 2 has a through hole 23 extending through itself along its radial direction for installing the ejector sleeve 4 or directly for installing the ejector 5. The through hole 23 intersects the extension lines of both the first water passage 10 and the second water passage 11. That is, under normal circumstances, if the through hole 23 penetrates the first water passage 10 and / or the second water passage 11, it means that the ejector 5 has broken the water passage. This situation is unacceptable because it directly affects the molding quality of the product. However, this solution uses the first insert 2 to block the flow, and also connects the first annular water channel 200 to the first water passage 10 and the second annular water channel 210 to the second water passage 11. The water flow in the first water passage 10 and the second water passage 11 can be smoothly guided without affecting the arrangement of the water passages or moving the position of the ejector pin 5. Multiple first sealing rings 3 are all fitted on the first insert 2. Furthermore, the first sealing rings 3 are fitted above and below the first annular water channel 200 and the second annular water channel 210 to prevent water leakage from the first annular water channel 200 and the second annular water channel 210.

[0044] In practical use, due to the complex structure of this product and the large sticking force during molding, numerous ejector pins 5 are arranged. The ejector pins 5 occupy a large area of ​​the mold core, which restricts the arrangement of the linear cooling water channels and easily leads to the ejector pins 5 breaking the water channels. When the position of the ejector pins 5 in the mold is already determined and the space is small, a first mounting hole 12 is opened on the mold core 1, and the first mounting hole 12 passes through the first water channel 10 and the second water channel 11. A first insert 2 is set in the first mounting hole 12, so that the first annular water groove 200 of the first insert 2 is connected to the first water channel 10 and the second annular water groove 210 is connected to the second water channel 11. Then, the upper and lower ends of the first annular water groove 200 and the second annular water groove 210 are sealed by the first sealing ring 3 to prevent the cooling water from flowing out from the first insert 2 when it flows through. In this state, it is not necessary to change the arrangement of the ejector pins 5, and the linear cooling is simple to process (for example, it can be achieved by deep hole drilling) and the cooling effect is good.

[0045] Preferably, such as Figure 1-2 and Figure 7 As shown, the mold cooling structure also includes an ejector sleeve 4 and an ejector pin 5. The ejector sleeve 4 is detachably inserted into the through hole 23, and the ejector pin 5 is movably inserted into the ejector sleeve 4. Since the ejector pin 5 is in constant motion, the ejector pin hole is easily worn large during its repeated ejection of products. The ejector sleeve 4 is provided to protect the first insert 2 and prevent the need to frequently replace the first insert 2. On the other hand, the ejector sleeve 4 can also play a certain role in waterproofing and prevent water from being brought into the mold. The first insert 2 has a second sealing ring 6 at its top, and the second sealing ring 6 is located between the first insert 2 and the mold core 1. The ejector sleeve 4 passes through the second sealing ring 6, and the second sealing ring 6 can further prevent water from flowing into the mold. The first insert 2 has a first threaded hole 24 at its bottom. The first threaded hole 24 is located at the middle position of the bottom surface of the first insert 2. When it is necessary to disassemble the first insert, it is convenient to screw in tools such as taps and lifting rings into the first threaded hole 24, so as to remove the first insert 24, which has high disassembly efficiency.

[0046] like Figure 3-6 and Figure 8As shown, the mold core 1 also has a third water channel 13, and the first mounting hole 12 passes through the third water channel 13 and communicates with the third water channel 13; the third water channel 13 is located above the first water channel 10 and the second water channel 11; wherein, the first insert 2 has a third annular water groove 220 along its own circumference, the third annular water groove 220 is located above the first annular water groove 200 and the second annular water groove 210, and the third annular water groove 220 communicates with the third water channel 13; the first sealing ring 3 is provided above and below the third annular water groove 220. The first sealing ring 3 is specifically set in that the first insert 2 has a sealing groove 25 along its own circumference, the first sealing ring 3 is set in the sealing groove 25, and the depth of the sealing groove 25 is less than the diameter of the first sealing ring 3, so as to ensure that the first sealing ring 3 is squeezed during the assembly process, thereby ensuring the sealing effect of the first sealing ring 3. The first water channel 10 and the second water channel 11 both penetrate the same side of the mold core 1, forming an inlet 14 and an outlet 15 on that side. Similarly, the third water channel 13 also forms an inlet and an outlet on the same side of the mold core 1, allowing the cooling water pipe to be connected to the injection molding machine from the same side of the mold. It should be explained that, for ease of processing, water channeling holes are usually drilled in the mold core 1. After drilling these holes, unnecessary holes can be plugged to prevent leakage. Furthermore, in some special parts of the product, localized cooling on the mold is required, which can be achieved using a water-blocking plate 18.

[0047] In actual use, this solution sets a third water channel 13 in the mold core 1, and the third water channel 13 is connected to the third annular water groove 220 of the first insert 2, which is equivalent to realizing the effect of stepped cooling on the first insert 2, further improving the cooling effect of the cooling system; and regardless of the first water channel 10, the second water channel 11 or the third water channel 13, their cooling circuits can form an inlet 14 and an outlet 15 on the same side of the mold core 1, which makes it convenient for the operator to connect the cooling water on the injection molding machine to the mold, making the operation convenient and efficient.

[0048] Preferably, the first insert 2 includes a first guide portion 20, a second guide portion 21, and a third guide portion 22 arranged sequentially from bottom to top, and the cross-sectional area of ​​the first guide portion 20 is larger than the cross-sectional area of ​​the second guide portion 21, and the cross-sectional area of ​​the second guide portion 21 is larger than the cross-sectional area of ​​the third guide portion 22; wherein, the first annular water tank 200 is formed on the first guide portion 20, the second annular water tank 210 is formed on the second guide portion 21, and the third annular water tank 220 is formed on the third guide portion 22.

[0049] Specifically, the cross-sectional dimensions of the first guide section 20, the second guide section 21, and the third guide section 22 gradually decrease. On the one hand, this facilitates the installation of the first insert 2 into the first mounting hole 12 of the mold core 1. On the other hand, it can effectively improve the sealing effect of the first sealing ring 3 on each guide section, that is, ensure that the first sealing ring 3 and the multi-step surface of the mold core 1 are in contact, and it is not easy for water leakage to occur.

[0050] More preferably, the cooling structure further includes a second insert 7 and a third sealing ring 8. The mold core 1 has a second mounting hole 16, which passes through the first water channel 10 and the second water channel 11, and communicates with both. The second insert 7 is detachably disposed in the second mounting hole 16, and has a fourth annular water groove 70 and a fifth annular water groove 71. The fourth annular water groove 70 communicates with the first water channel 10, and the fifth annular water groove 71 communicates with the second water channel 11. The third sealing ring 8 is sleeved on the second insert 7, and is located above and below the fourth annular water groove 70 and the fifth annular water groove 71. The design principle of the second insert 7 is similar to that of the first insert 2, and will not be described in detail here. Furthermore, at the ejector pin sleeve mounting hole (not marked) of the second insert 7, a threaded section can be provided at its tail end, allowing for easy removal of the second insert 7 without affecting the installation of the ejector pin sleeve 4.

[0051] The bottom surfaces of the first insert 2, the second insert 7, and the mold core 1 are all flush; and the bottom surface of the mold core 1 is provided with a plurality of second threaded holes 17 along the periphery of the first insert 2 and the periphery of the second insert 7. The provision of the second threaded holes 17 allows for the addition of fixing plates on the back side of the first insert 2 and the second insert 7, further fixing the first insert 2 and the second insert 7 and preventing the first insert 2 and the second insert 7 from detaching from the mold core 1, thus preventing the mold from leaking.

[0052] In this design, the cooling structure can be configured within the confined space of the mold to achieve a cooling circuit with good cooling effect.

[0053] The specific embodiments described herein are merely illustrative of the spirit of the invention. Those skilled in the art to which this invention pertains may make various modifications or additions to the described specific embodiments or use similar methods to substitute them, without departing from the spirit of the invention or exceeding the scope defined by the appended claims.

Claims

1. A cooling structure for a mold, characterized in that, Including: The mold core has a first water channel and a second water channel opened along its height direction; the first water channel and the second water channel are interconnected; the mold core has a first mounting hole, which passes through the first water channel and the second water channel and is connected to both the first water channel and the second water channel; A first insert is detachably disposed in the first mounting hole; the first insert has a first annular water groove and a second annular water groove along its circumference, and the first annular water groove and the second annular water groove are at different heights relative to the first insert; the first annular water groove is connected to a first water passage, and the second annular water groove is connected to a second water passage; the first insert has a through hole along its radial direction; the through hole intersects the extension lines of both the first water passage and the second water passage. Multiple first sealing rings are all fitted onto the first insert; and the first sealing rings are fitted above and below the first annular water groove and the second annular water groove. It also includes a ejector sleeve and an ejector pin, wherein the ejector sleeve is detachably inserted into the through hole and the ejector pin is movably inserted into the ejector sleeve; The mold core is also provided with a third water channel, and the first mounting hole passes through the third water channel and communicates with the third water channel; the third water channel is located above the first water channel and the second water channel; wherein, the first insert is provided with a third annular water groove along its own circumference, the third annular water groove is located above the first annular water groove and the second annular water groove, and the third annular water groove is communicated with the third water channel; the first sealing ring is provided above and below the third annular water groove; The first insert includes a first guide portion, a second guide portion, and a third guide portion arranged sequentially from bottom to top, wherein the cross-sectional area of ​​the first guide portion is larger than the cross-sectional area of ​​the second guide portion, and the cross-sectional area of ​​the second guide portion is larger than the cross-sectional area of ​​the third guide portion; wherein, the first annular water channel is formed on the first guide portion, the second annular water channel is formed on the second guide portion, and the third annular water channel is formed on the third guide portion.

2. The cooling structure for a mold according to claim 1, characterized in that, The first insert has a second sealing ring on its top, and the second sealing ring is located between the first insert and the mold core; wherein the ejector pin sleeve passes through the second sealing ring.

3. The cooling structure for a mold according to claim 2, characterized in that, The first insert has a first threaded hole at its bottom.

4. The cooling structure for a mold according to claim 1, characterized in that, The first insert has a sealing groove along its circumference, the first sealing ring is disposed in the sealing groove, and the depth of the sealing groove is less than the diameter of the first sealing ring.

5. The cooling structure for a mold according to claim 1, characterized in that, The first water channel and the second water channel both penetrate the same side of the mold core, and form an inlet and an outlet on the side.

6. The cooling structure for a mold according to claim 1, characterized in that, It also includes a second insert and a third sealing ring. The mold core has a second mounting hole, which passes through the first water passage and the second water passage and is connected to the first water passage and the second water passage. The second insert is detachably disposed in the second mounting hole, and the second insert is provided with a fourth annular water groove and a fifth annular water groove. The fourth annular water groove is connected to the first water channel, and the fifth annular water groove is connected to the second water channel. The third sealing ring is sleeved on the second insert, and the third sealing ring is provided above and below the fourth annular water groove and the fifth annular water groove.

7. The cooling structure for a mold according to claim 6, characterized in that, The bottom surfaces of the first insert, the second insert, and the mold core are all flush; and the bottom surface of the mold core is provided with a plurality of second threaded holes along the periphery of the first insert and along the periphery of the second insert.

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